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, <br /> � • �I`� I��, !�/c,,,.✓� : <br /> � � . <br /> , � <br /> ; <br /> � OUTLINE OF DRAINAGE DETGNTION CALCULA'PIONS ; <br /> � ► CU�n. ; <br /> GRAND AVENUE CONDOMINIUMS + <br /> i <br /> NEAR THE INTERSECTION OF GRAND AVENUE AND 20th STREETS � <br /> i <br /> , <br /> : <br /> f <br /> 1. THE PROPOSED CONDOMINIIIM SITE IS WITHIN THE BOUNDARIES OF <br /> AREA A AS DESIGNATED ON THE CITY OF EVERETT DRAINAGE PLAN REQUIRIN(i � <br /> d <br /> A STORM PARAMETER OF ONE IN TEN YEARS FOR BOTH THE BEFORE AND AFTER A <br /> f <br /> r <br /> DEVELOPMENT CONDITION. . � <br /> 2 . THE DRHINAGE AREA OF TI�E SITE AFFECTEA BY DEVELOPMENT IS <br /> 0.2� ACRES. � <br /> i 3. CURRENTLY ALL RIINOFF GENERATED ON TNE SITE FLOWS OVER i <br /> i AN EMBANKMENT ON THE WE3T SIDE OF a'HE PROPERTY TOWARD PUGET SOUND. � <br /> I � <br /> A COMBINED SEWER EXISTS IN GRAND AVENUE, BUT AT AN ELEVATION THAT <br /> WILL NOT ALLOW RUNOFF FROM THE PARKING AND DRIVEWAY AREAS TO FLOW <br /> � <br /> SY ORAVITY� BUT ONLY FROM THE ROOF DRAINS. FOR THIS REASON, DRAINAOE , � <br /> , AREA3 SEPARATIN(i ROOF RUNOFF FROM DRIVEWAY AREA RUNOFFS WERE <br /> 3EUREOATED ON THE DRAINAOE 3TUDY MAP. � <br /> 4 . THE DRAINA(lE AREA IS DIVIDED INTO SUB AREAS ON THE � <br /> DRAINAUE STUDY MAP WHICH ARE LABELED AND 3IZED AS FOLLOWS : � <br /> SUB AREA SIZE IN ACRES ' <br /> p 0.19 <br /> r ` g 0.03 � <br /> ; C o.05 � <br /> � , <br /> � 5. THE COLLECTION SYSTcM FOR SUB AREA A CONSISTS OF ROOF <br /> DRAINS DIRECTIN6 RUNOFF TO THE COMBINED SYSTEM IN GRAND AVENUB. FOR <br /> SUB AP.EAS B AND C IT CONSISTS OF CATCH BASINS AP7D PIPING DIRECTINU <br /> RUNOFF TO A SINGLE RETENTION AREA. <br /> 6. NO DETENTION STORA(3E FOR SUB AREA A IS PROVIDED BECAUSE <br /> Page 1 of 2 ' <br />